Ammunition and explosives – Projectiles – Composite
Patent
1988-05-18
1990-03-13
Tudor, Harold J.
Ammunition and explosives
Projectiles
Composite
156 734, 156293, F42B 3100, B32B 3116
Patent
active
049075136
ABSTRACT:
An obturating band of the despun variety is manufactured within the channel of a projectile assembly. A split ring polymer pre-band is clamped around the band seat of the projectile assembly and the free ends are welded together to form a continuous ring around the diameter of the projectile assembly within the encircling channel. One free end includes a male connector and the other free end includes an undersized female receptacle. Upon exposure to ultrasonic energy, the free ends are welded together at a scarf joint. A calculated amount of extra material which is present in the male connector is allows the joint to weld itself. The joining surfaces are positioned on indented sections of the free ends such that the resulting obturating band does not bulge at the joint. The obturating band is constructed to slip against the band seat and, therefore, is allowed to rotate at a rate independent of the underlying projectile.
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"Silicones Improve Self-Lubricating Thermoplastics" by John E. Theberge, Machine Design 9-6-84, pp. 108-111.
Manion Michael C.
Ralph Vernon C.
Honeywell Inc.
Tudor Harold J.
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